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A method to reduce the engine noise by the right time of the engine of the engine

A timing gear and engine technology, applied in the direction of components with teeth, belts/chains/gears, mechanical equipment, etc., can solve the problem of limited improvement of gear accuracy, reduce friction, improve transmission smoothness, and reduce noise. Effect

Active Publication Date: 2019-04-02
GUIZHOU QUNJIAN PRECISION MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many factors that affect the noise level in gear transmission, mainly including gear pressure angle, coincidence degree, gear precision, material and hardness, etc. After research, it is found that gear precision is the most important factor affecting noise, but it is affected by processing equipment, processing technology and manufacturing. Due to cost constraints, the improvement of gear precision is limited, and the noise problem cannot be solved simply by improving gear precision. Therefore, it is necessary to carry out a certain degree of practice on the teeth according to the meshing conditions of the gears on the basis of ensuring a certain gear precision, so as to meet Noise Reduction Requirements

Method used

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  • A method to reduce the engine noise by the right time of the engine of the engine
  • A method to reduce the engine noise by the right time of the engine of the engine
  • A method to reduce the engine noise by the right time of the engine of the engine

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Embodiment

[0025] The modified gear in this example is as Figure 8 As shown, the gear parameters are as follows: modulus m=1.75, number of teeth z=31, pressure angle α=17.5°, helix angle β=31° (right-handed). Figure 9 Local zoom in as Figure 10 as shown, Figure 10 Among them, Fβ is the tooth direction along the tooth width trajectory, and Fα is the tooth root to tooth top trajectory.

[0026] The specific implementation method is as follows:

[0027] According to the technical solution of the present invention, the tooth direction Fβ is modified, and the tooth direction sectional view is as follows Figure 9 As shown, the helix angle deviation FHβ within the tooth width range of 32mm is controlled to be ±3μm, the drum shape Cβ is controlled to be 4-9μm, and the edge trimming amount is 3-8μm in the range of 4mm at both ends of the tooth width.

[0028] According to the technical scheme of the present invention, the tooth shape Fα is modified, and the tooth shape cross section is a...

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Abstract

The invention discloses a method for reducing the noise of an engine by shaping a timing gear of the engine. According to the method, different noise reduction and shaping schemes are provided according to different requirements of a driving face and a driven face of a tooth part of the timing gear of the engine, and the noise reduction and shaping schemes comprise tooth direction shaping, tooth profile shaping, tooth root shaping and tooth top shaping. By the adoption of the method, friction of the gear in the engagement process is reduced, the transmission smoothness is improved, and accordingly the noise generated in the gear engagement process is effectively reduced.

Description

technical field [0001] The invention relates to a method for reducing engine noise by modifying the timing gear of the engine, and belongs to the technical field of gear processing. Background technique [0002] At present, the vast majority of automobile manufacturers have higher and higher requirements for engine noise, and they all require to be controlled below a certain level. The mechanical noise generated during the gear transmission process is one of the main sources of engine noise. There are many factors that affect the noise level in gear transmission, mainly including gear pressure angle, coincidence degree, gear precision, material and hardness, etc. After research, it is found that gear precision is the most important factor affecting noise, but it is affected by processing equipment, processing technology and manufacturing. Due to cost constraints, the improvement of gear precision is limited, and the noise problem cannot be solved simply by improving gear pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H55/08
CPCF16H55/0806F16H2055/086
Inventor 龙见炳申曙光
Owner GUIZHOU QUNJIAN PRECISION MACHINERY
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